This same issue bit me using 18.04. I think this should really be reclassified as an installer bug. Ubuntu has known for many releases that a single btrfs root partition does not work properly. The installer should warn people when they use a single partition that is btrfs that grub cannot write to it and you may want a separate ext4 /boot partition to avoid problems.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/736743 Title: environment block not implemented on btrfs To manage notifications about this bug go to: https://bugs.launchpad.net/grub/+bug/736743/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
